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为阐述放射性~9C束流应用于治癌的物理基础,运用一个球形生物组织等效正比计数器测量了~9C束流不同贯穿深度上的线能谱,得到了沿束流贯穿深度上的剂量平均线能分布。将实验测量得到的线能谱转换成为不同传能线密度在吸收剂量中所占份额的分布,得到了该~9C束流在不同贯穿深度上的剂量平均传能线密度分布。将生物组织等效正比计数器测量得到的与先前通过平行板正比计数器测量得到的该~9C束流的剂量平均传能线密度分布进行比较,发现:在束流入射通道上,两者测量数据符合很好,而在束流Bragg峰附近~9C离子的沉积区域,由组织等效正比计数器测量得到的剂量平均传能线密度值大于由平行板正比计数器测量得到的值。
In order to describe the physical basis of radioactive ~ 9C beam application in cancer treatment, a spherical biological tissue equivalent proportional counter was used to measure the line energy spectrum of ~ 9C beam at different penetration depths, and the dose average along the beam penetration depth Line can be distributed. The experimentally measured line spectra were converted into the distribution of the different transmission line densities in the absorbed dose, and the average dose density distribution of the ~ 9C beam at different penetration depths was obtained. Comparing the dose mean transmission line density distribution of the ~ 9C beam measured by the equivalent proportional counter of the biological tissue with that previously measured by the parallel plate proportional counter, it is found that the measured data of the beam are in agreement with Well, whereas in the deposition area of ~ 9C ions near the Bragg peak of the beam, the mean value of the transmitted energy density measured by the tissue equivalent proportional counter is greater than the value measured by the parallel plate proportional counter.